I spend a lot of time outside, do I still need Vitamin D?

You can get Vitamin D from the sun but with the sunblock you may not be able to get all you need , you could get vitamin D through food ie fatty fish , milk , yogurt, orange juice or breakfast cereal.

Vitamin D is the most undervalue nutrients since most people assume they get enough from the sun. Although sunlight is one source of vitamin D but there are vitamin D deficiency can be the underlying cause of many health problems such as , fatique, bone, joint , muscle pain, sour mood, low energy, anxiety , more frequent illness. Vitamin D has multiple roles in the body. It helps to fight disease, strengthen your bones , muscles and oral health , reduce depression and anxiety, boost weight loss, support the immune system and flight inflammation, can help prevent Type 1 and Type 2 diabetes, can treat hypertension, reduce the risk of some cancer.

If you don't get enough from food or sunlight The daily dose of 1000-2000IU of D3 is recommended.

Look for a certified pharmaceutical grade to make sure you're not wasting your money.